I agree. There is certainly a component of “book learning” but most of the process is an apprenticeship in Christian living - which can’t be done on-line, or at least, not easily.
It is also a Preparation for the Sacraments, which definitely can’t be done on-line - the Sacraments involve other people, and must be done in person. It’s important, also, that the RCIA members become a community of support for one another. While there is a limited sense in which this can be done on line, it’s much more effective when it happens in person.
PS: There are lots of on-line learning tools for Catholics at every stage of spiritual development; I would hope and expect that RCIA candidates and Catechumens are already making use of them, and not depending on their local parish to provide everything on a silver spoon. But what the parish is really good at is providing the Rites, and the community in which they happen, and the Sacraments.
As for the lack of time, people make time for the things that are important to them. If someone is saying, “I don’t have time,” it is just a polite way of saying, “I am not interested.” Everyone has exactly the same amount of time given to them; we all spend it on the things that we are interested in, and that are important to us. I have seen people move heaven and earth to get to RCIA classes because they knew it was the salvation of their souls - they canceled trips, and they rearranged their work schedules to be there; I have seen people who preferred to watch TV rather than come to RCIA, because they didn’t see the point. Guess which ones are still Catholic today?